Posted by Goose on May 18, 2013 at 15:05:08 from (70.197.194.37):
Have a garden tractor with a 24 hp B&S OHV engine.
Went to use it this morning, and it ran on only one cylinder and made a "popping" sound in the air cleaner. Did some trouble shooting and found a bent push rod.
This engine has about 300 hours on it, and has never been opened up, so why would a push rod decide to bend? I can operate the rocker arm and valve by hand, and it feels like it should. I straightened the push rod and put it back in. It bent again when I turned the engine over by hand.
I can't see any reason for the rod to bend unless it's a defective rod. Even if the key sheared in the flywheel, all that would do would be throw the engine out of time, it wouldn't cause a piston to hit a valve.
I'll admit, I've never had one of these OHV's apart and I'm not sure what drives the cam.
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